Select correct answer.

Emma forgot meeting Ryan when she was a child. Now, she forgets to get his number when they meet each other again.

Emma forgot meeting Ryan when she was a child. Now, she forgets to get his number when they meet each other again.

We use gerund after forget when you forget something that you should have done in the past. Emma forgot meeting Ryan when she was a child. Now, she forgets to get his number when they meet each other again. We use infinitive with to after forget when you forget something you need to do.